<template>
    <div>
         <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            
            <!-- 步骤条   将像数字的字符串转换成数值-->
            <el-steps :space="200" :active="activeIndex -0" 
            finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            
            <!-- tab栏区域   el-tab-pane 外面只允许嵌套el-tabs-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
            label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" 
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <!-- 基本信息表单 -->
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        
                        <!-- 商品分类的级联选择器 -->
                        <el-form-item label="商品分类" prop="goods_cat">
                             <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                        
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                        :key="item.attr_id"></el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">商品属性</el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action:图片要上传的api接口  on-preview:预览的事件-->
                        <el-upload
                            class="upload-demo"
                            :action="uploadUrl"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_intorduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
            
            
        </el-card>
        
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="perviewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>


<script>

import _ from 'lodash'

export default {
    data(){
        return{
            // 进度条被激活的页数
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price :0,
                goods_weight:0,
                goods_number:0,
                
                // 商品所属的分类数组
                goods_cat:[],
                
                // 图片的数组
                pics:[],
                
                //商品详情描述
                goods_intorduce:''
                
            
            },
            // 表单验证规则对象
            addFormRules:{
                goods_name:[
                    {required: true, message:'请输入商品名称', trigger: 'blur'}
                ],
                goods_price :[
                    {required: true, message:'请输入商品价格', trigger: 'blur'}
                ],
                goods_weight:[
                    {required: true, message:'请输入商品重量', trigger: 'blur'}
                ],
                goods_number:[
                    {required: true, message:'请输入商品数量', trigger: 'blur'}
                ],
                goods_cat:[
                    {required: true, message:'请选择商品分类', trigger: 'blur'}
                ]
            },
            // 商品分类列表
            catelist:[],
            
             // 级联选择框的配置对象
            cateProps:{ 
                expandTrigger: 'hover',
                value:'cat_id',
                label:'cat_name',
                children:'children'
           },
        //    动态参数列表数据
           manyTableData:[{
               0:{
                   attr_id:3077,
                   attr_name:'segi'
               },
               1:{
                   attr_id:13,
                   attr_name:'rgbhderth'
               }
           }],
        //    上传地址
           uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
        //   图片上传组件的headers请求头对象 
           headerObj:{
               Authorization:window.sessionStorage.getItem('token')
           },
               // 预览图访问地址
            previewPath:'',
            // 默认隐藏图片预览对话框
            perviewVisible:false
            
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !==200){
                return this.$message.error('获取商品分类数据失败！')
            }
            
            this.catelist = res.data
            // console.log(this.catelist);
        },
        // 级联选择器选中变化会触发的函数
        handleChange(){
            // console.log(this.addForm.goods_cat);
            // 级联选择器的选择范围问题
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
              
            }
        },
        // tab切换需要满足的条件
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页'+oldActiveName);
            // return false
            if(oldActiveName === '0' && this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        // 点击tab后执行的函数
        async tabClicked(){
            // console.log(this.activeIndex);
            // 访问的是动态参数面板
            if(this.activeIndex ==='1'){
                const {data:res} = await this.$http.get(`categories/${this.addForm.goods_cat}/attributes`,
                {params:{sel:'many'}
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                // console.log(res.data);
                // this.manyTableData = res.data
                // console.log(this.manyTableData);
            }
        },
        
        // 处理图片预览效果
        handlePreview(file){
            // console.log(file);
            this.previewPath = file.response.data.url
            this.perviewVisible = true
        },
        
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file);
            // 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic ===filePath)
            // 调用数组的splice方法，吧图像信息从pics数组中移除
            this.addForm.pics.splice(i,1)
            // console.log(this.addForm);
            this.$message.success('图片移除成功！')
        },
        
        // 监听图片上传成功
        handleSuccess(response){
            // console.log(response);
            // 拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            // 将图片信息对象push到pics数组中
            this.addForm.pics.push(picInfo)
            
            // console.log(this.addForm);
            this.$message.success('图片上传成功！')
        },
        
        // 添加商品
        add(){
            // console.log(this.addForm);
            
            //  判断所有输入的信息是否合法
            this.$refs.addFormRef.validate( async valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                // 执行添加的业务逻辑
            // lodash  cloneDeep(obj)  深拷贝
            const form =  _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // console.log(form);
            
            
            // 发起请求添加商品
            // 商品名称必须是唯一的
            const { data:res} = await this.$http.post('goods',form)
            if(res.meta.status !==201){
                return this.$message.error('添加商品失败！')
            }
                this.$message.success('添加商品成功！')
                    // 跳转路由
                this.$router.push('/goods')
            })
        }
    },
    // computed:{
    //     // 
    //     // eslint-disable-next-line vue/return-in-computed-property
    //     cateId(){
    //         if(this.addForm.good_cat.length ===3){
    //            return this.addForm.good_cat[2]
    //            console.log(this.addForm.good_cat[2]);
    //         }
    //         return null
    //     }
    // }
}
</script>
<style lang="less" scoped>
    .previewImg{
        width: 100%;
    }
    .btnAdd{
        margin-top: 15px;
    }
</style>
